Replace get(history_id) with get_preview() which is more lightweight. Thanks to Nicola for the pointer.
Replace get(history_id) with get_preview() which is more lightweight. Thanks to Nicola for the pointer.

bgruening/docker-ipython-notebook,bgruening/docker-jupyter-notebook,bgruening/docker-ipython-notebook,bgruening/docker-jupyter-notebook,bgruening/docker-jupyter-notebook,bgruening/docker-ipython-notebook